<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<style>
	#div1 {width: 100px; height: 150px; background: red; position: absolute;right: 0; bottom: 0;}
</style>
<script>
	window.onscroll = function()
	{
		 var oDiv = document.getElementById('div1');
			var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
			oDiv.style.top = document.documentElement.clientHeight - oDiv.offsetHeight + scrollTop + 'px';
	};
</script>
</head>

<body style="height: 2000px">
<div id="div1"></div>
</body>
</html>
